Researchers have made progress in studying the ultra-wideband radiation properties of 19 pulsars

The flow density, contour shape, pulse width, and polarization properties of radio pulsars are the basic physical measurements of pulsars. Understanding this information can help to better understand the structure and radiation mechanism of the radiation region of pulsars. Recently, Zhou Zurong, a doctoral student in the pulsar cluster of the Xinjiang Astronomical Observatory, and his collaborators used the observation data of the ultra-wideband low-frequency receiver of the Parkes 64-meter radio telescope to study the ultra-wideband radiation properties of 19 radio pulsars, and found that the flow, pulse width, and polarization properties of multiple pulsars have diversified with frequency evolution, and the research results have been published in Astronomy and Astrophysics Research (RAA, 2022, 22, 085001).

The researchers divided the ultra-wideband data into three sub-frequency bands and measured their traffic density separately, and then performed a spectral fit. The study found that the spectrum of most pulsars conforms to the simple power law spectroscopy model, and the spectrum of the pulsar J1810-5338 is deflected at 600MHz, which is in line with the relatively rare deflection power law spectrum. The researchers measured the polarization profiles of 13 pulsars at the center frequencies of 1369MHz and 2368MHz, respectively, and found direct evidence that some pulsars may have evolved in frequency (Figure 1).

Figure 1: Polarization profile of PSR J1848-1952 at center frequencies 1369 and 2368 MHz, with red lines representing line polarization and blue lines representing circular polarization.

Follow-up researchers will use the Parkes 64-meter or FAST radio telescope to make long-term high-sensitivity single-pulse observations of these pulsars in multiple frequency bands, and conduct more in-depth research on topics such as the evolution of pulsars and the structure of their radiation regions. (Source: Xinjiang Astronomical Observatory, Chinese Academy of Sciences)

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